For which of the following
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Chemistry: Atoms First
- Calculate the entropy change for each of these processes. thereby verifying the predictions made in Conceptual Exercise 16.4. (a) 2 CO2(g) 2 CO(g) + O2(g) (b) NaCl(s) NaCl(aq) (c) MgCO3(s) MgO(s) + CO2(g)arrow_forwardGiven the following information at 25C, calculate G at 25C for the reaction 2A(g)+B(g)3C(g) Substance Hf(kJ/mol) S(J/molK) A(g) 191 244 B(g) 70.8 300 C(g) 197 164 a 956 kJ b 956 kJ c 346 kJ d 346 kJ e 1.03 103 kJarrow_forwardA solid sample of copper, Cu(s), is placed in a test tube containing a solution of nitric acid, HNO3(aq). When the substances are mixed the solution turns bluish-green, a brown gas is produced and the temperature of the test tube is observed to increase. What are the signs of △Hsys,△Ssys,△Gsys,△Suniv? △Hsys : positive, negative, or impossible to determine △Ssys : positive, negative, or impossible to determine △Gsys : positive, negative, or impossible to determine △Suniv : positive, negative, or impossible to determine As temperature increases, the reaction becomes _____ spontaneous. A) more B) lessarrow_forward
- In which case will a chemical reaction ALWAYS proceed spontaneously at all temperatures (DH and DS represent the enthalpy and entropy of the reaction, respectively)? Select one: a. DH < 0 and DS < 0 b. DH < 0 and DS > 0 c. DH > 0 and DS > 0 d. DH > 0 and DS < 0arrow_forwardQ2.) For a particular reaction, ΔH = -32 kJ and ΔS = -90 J/K . Assume that ΔH and ΔS do not vary with temperature. 1. At what temperature will the reaction have ΔG=0? (Express your answer using two significant figures.) 2. If T is increased from that in part A, will the reaction be spontaneous or nonspontaneous?arrow_forwardFor which set of conditions is the reaction always nonspontaneous? ΔH = + and ΔS = + ΔH = - and ΔS = - ΔH = - and ΔS = + ΔH = + and ΔS = - ΔH = 0 and ΔS = 0arrow_forward
- 4) For EACH process below, state whether S is positive, negative, or zero, and BRIEFLY STATE WHY. Use entropy considerations only. a) condensing ether vapor b) melting iron metal c) dissolving solid sucrose in water d) cooling N2 gas from 85 oC to 20 oCarrow_forwardAt 25 degrees C, what are the signs of deltaH, deltaS, and deltaG for I2(s)-->I2(g)?arrow_forwardFor the combustion of CH4 into CO2 and H2O vapor, do you expect ΔS to be positive or negative for this reaction?arrow_forward
- 7.) What do you expect for the sign of Δ S in a chemical reaction in which 2 mol of gaseous reactants are converted to 3 mol of gaseous products? Group of answer choices A.) Δ S is equal to zero B.) Δ S is negative C.) Δ S is positivearrow_forward1. Which of the following processes are spontaneous a. cooling of a hot flat iron b. drop of ink dispersing in water c. straightening curly hair d. cold water warming to room temperature e. sorting names alphabetically f. black hair turning grey g. wind scattering leaves in a pile h. shoveling snow i. removin stain from a cloth j. sublimation of naphthalene at room temperaturearrow_forward7. “A diamond is forever” is one of the most successful advertising slogans of all time. But is it true? For the reaction shown below, calculate the standard free energy change at 298K and determine whether or not a diamond is “forever”. C(diamond) → C(graphite)Data: ΔHf°(diamond) = 1.895 kJ/mol; S°(diamond) = 2.337 J mol−1K−1; S°(graphite) = 5.740 J mol−1K−1.A) ΔG° = 2.19 kJ; foreverB) ΔG° = −1.90 kJ; not foreverC) ΔG° = −2.90 kJ; not foreverD) ΔG° = 1.90 kJ; foreverE) ΔG° = < −1000 kJ; not foreverarrow_forward
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